CN103805856B - The corrosion-resistant ocean structure steel of yield strength >=800MPa and production method - Google Patents
The corrosion-resistant ocean structure steel of yield strength >=800MPa and production method Download PDFInfo
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- CN103805856B CN103805856B CN201410092715.4A CN201410092715A CN103805856B CN 103805856 B CN103805856 B CN 103805856B CN 201410092715 A CN201410092715 A CN 201410092715A CN 103805856 B CN103805856 B CN 103805856B
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Abstract
The corrosion-resistant ocean structure steel of yield strength >=800MPa, its component and weight percent content are: C:0.08 ~ 0.18%, Si:? 0.15% ~ 0.25%, Mn:1.10% ~ 1.50%, P:0.08% ~ 0.25%, S≤0.002%, Ni:0.15% ~ 0.30%, Cu:0.5% ~ 0.9%, Mo:0.08% ~ 0.18%; Production stage: to smelt and continuous pouring becomes thickness to be the slab of 200 ~ 300mm; To strand soaking; Be rolled in two stages; Carry out water-cooled; Naturally cool to room temperature; Carry out isothermal holding; Air cooling is to room temperature.Yield strength of the present invention be not less than 800MPa, year erosion rate lower than 0.19g/mm
2y, and hot and cold processing performance is excellent, is cut into point relatively simple, easy to control.
Description
Technical field
The present invention relates to a kind of offshore platform steel and production method thereof, belong to the corrosion-resistant ocean structure steel of a kind of yield strength >=800MPa and production method particularly.
Background technology
Marine drilling platform auxiliary facility is if the steel construction such as helipad, large-scale jack lift is because being subject to sea atmosphere corrosion impact for a long time; and by stronger External Force Acting; under the acting in conjunction of corrosion and stress, the most easily there is acceleration fracture failure, and cause serious disastrous effect.On the other hand, these steel construction due to comparatively large by external force, therefore require high to the yield strength of steel in operational process, and corrosion resistance nature requires to want better.
Through retrieval, in the prior art, Chinese Patent Application No. is the patent documentation of 200610024963.0, it discloses one " resistant to sea water and humid environment corrosion steel ", chemical composition is C:0.06% ~ 0.09%, Si:0.20 ~ 0.50%, Mn:0.30% ~ 0.40%, Cr:1.00% ~ 1.20%, Al:0.40% ~ 0.60%, Mo:0.25% ~ 0.35%, P :≤0.015%, S≤0.010%, Cu :≤0.15%, Ni≤0.20%, Ti≤0.020%, Sn≤0.020%, As≤0.020%, Pb≤0.0025%, Bi≤0.010%, Sb≤0.004%, [N]≤0.030%, [O]≤0.0025%, [H]≤0.00015%, all the other are Fe and inevitable impurity.Just refine through electric arc furnace, ladle furnace vacuum refinement, rolling mill hot-work rolling become a useful person.This patented technology weak point is that in steel, Strong oxdiative alloy element Al content is too many, up to 0.60%, easily forms the thick Al of particle
2o
3and not easily Ex-all, reduce fracture toughness property and the plate surface quality of steel, the Al generated in casting process
2o
3the easy blocking casting mouth of a river, causes industrial accident.With the addition of the Cr of 1.00% ~ 1.20% in steel, easily in steel, formation contains the series compound of Cr as Cr
2c
3, Cr
6c
23deng, add the electropotential of inclusion and Fe matrix, easily cause corrosion, especially easily spot corrosion occurs.
Chinese Patent Application No. is the patent documentation of 200780006797.4, it discloses " corrosion-resistant steel material for ship and vessel ", this corrosion-resistant steel material for ship and vessel in mass %, containing C:0.03 ~ 0.25%, Si:0.05 ~ 0.50%, Mn:0.1 ~ 2.0%, below P:0.025%, below S:0.01%, Al:0.005 ~ 0.10%, W:0.01 ~ 1.0%, more than Cr:0.01% and be less than 0.20%, as required also containing a kind that is selected from Sb:0.001 ~ 0.3% and Sn:0.001 ~ 0.3% or 2 kinds, and/or be selected from Ni:0.005 ~ 0.25%, Mo:0.01 ~ 0.5%, one kind or two or more in Co:0.01 ~ 1.0%, surplus is made up of Fe and inevitable impurity.This patented technology weak point is to have a mind to the addition of alloying element W, and content is in 0.01 ~ 1.0% scope, W fusing point is very high, form simple substance W in Yi Gang to be mingled with, reduce the corrosion resistance nature of steel, again because Cr content is less than 0.20% more than 0.01% in steel, to add in steel containing Cr inclusion kind and quantity, be unfavorable for the corrosion resistance nature improving steel.
Summary of the invention
The present invention is directed to the yield strength that prior art exists low, be namely no more than 750MPa, resist stronger extraneous moving load not, the deficiency of sea water corrosion resistant difference, provide a kind of yield strength be not less than 800MPa, year erosion rate lower than 0.19g/mm
2y, and the excellent corrosion-resistant ocean structure steel of hot and cold processing performance and production method.
One of failure mode that oceanographic engineering steel construction stress+corrosion failure is common, the resistance to sea atmosphere corrosion performance improving steel is the important measures strengthening steel construction safe operation.The invention reside in by high P and the resistance to sea atmosphere corrosion performance of the alloying element guarantee steel such as auxiliary Ni, Cu in certain content.Another feature of the present invention is add appropriate alloying element and implement manufacture method of the present invention, obtains the steel of yield strength >=800MPa, ensures the mechanical property of steel, ensures steel construction interior safe operation in-service.
The application to achieve these goals, its result is conducted in-depth research on the rise impact or the alloying element of keying action and technique of the object realizing the application, even if in order under the prerequisite ensureing comprehensive mechanical property, year erosion rate can also be realized and is less than 0.19g/mm
2the corrosion resistant object of y, therefore propose employing and mainly have employed Cu, Ni element in composition, object is the compound action of Cu, Ni, O in opposing ocean environment
2-corrosion.Under ocean environment, [Cu], [Ni] and [O] that add in steel has an effect, the Cu of generation
xo
y, Ni
no
mbe attached to closely on Fe matrix, prevent O
2-further intrusion corrosion; Next additionally uses Mo element, the Mo formed with Ni element reaction
ani
bseries compound can effectively resist Cl in ocean environment
-corrosion harmfulness, the corrosion resistant object of steel can be reached further; The optimization of composition, also need mate technique, therefore, the application after deliberation, microtexture that process aspect mainly takes " similar " (bainite ferrite+ferrite) manufacturing process measure.At first stage, subordinate phase rolling intermediate controlled workpiece thickness at 60 ~ 120mm, object is to obtain the bainite structure being not less than 70%, because the solid solution capacity of bainite interstitial atoms C etc. is higher than ferrite, the mechanical property of yield strength >=800MPa can be obtained.All Fe is not had in bainite and ferrite
3c separates out, and more do not have pearlitic structure, the electropotential of the two is close, corrosion resistance nature is better than " foreign peoples " tissue (as ferrite+cementite).
Realize the measure of above-mentioned purpose:
The corrosion-resistant ocean structure steel of yield strength>=800MPa, its component and weight percent content are: C:0.08 ~ 0.18%, Si:0.15% ~ 0.25%, Mn:1.10% ~ 1.50%, P:0.08% ~ 0.25%, S≤0.002%, Ni:0.15% ~ 0.30%, Cu:0.5% ~ 0.9%, Mo:0.08% ~ 0.18%, remaining is Fe and inevitable impurity; Mechanical property: yield strength is all not less than 800MPa, year erosion rate be less than 0.19g/mm
2y, metallographic structure: bainite accounts for volume percent and is not less than 70%, all the other are ferrite.
Preferably: the weight percent content of Ni is 0.23 ~ 0.30%.
Preferably: the weight percent content of Cu is 0.62 ~ 0.83%.
Preferably: the weight percent content of Mo is 0.087 ~ 0.145%.
The method of the corrosion-resistant ocean structure steel of production yield strength >=800MPa, its step:
1) converter smelting the content of control S become thickness to be the slab of 200 ~ 300mm in setting range, continuous pouring;
2) to strand soaking, controlling strand soaking temperature is: 1180 ~ 1250 DEG C;
3) be rolled in two stages: control first stage start rolling temperature and be not less than 990 DEG C, its end temp is not less than 950 DEG C, and controls workpiece thickness at 60 ~ 120mm; Control subordinate phase start rolling temperature not higher than 940 DEG C, its stage finishing temperature is at 770 ~ 880 DEG C;
4) carry out water-cooled, under speed of cooling is 5 ~ 25 DEG C/s, is cooled to 470 ~ 570 DEG C;
5) room temperature is naturally cooled to;
6) carrying out isothermal holding to steel plate, is that the lower insulation of 570 ~ 630 DEG C is after 1 ~ 2 hour in holding temperature;
7) after coming out of the stove, air cooling is to room temperature.
The effect of each element and master operation in the present invention
C: for obtaining yield strength >=800MPa, add appropriate strengthening element C in steel, C element belongs to gap schedule of reinforcement in the present invention, avoids the precipitation strength mode formed by C as far as possible.C is lower than 0.08% by manufacture method of the present invention, and yield strength is difficult to reach 800MPa, and C content produces perlite higher than in 0.18%, Yi Gang, significantly reduces the resistance to sea atmosphere corrosion performance of steel, therefore controls its content 0.08 ~ 0.18%.
P: the P adding certain content in steel is conducive to the resistance to sea atmosphere corrosion performance improving steel, if but in steel P content higher than 0.25%, easily cause fragility, therefore its content to be controlled.
S≤0.002%, in steel, S makes resistance to sea atmosphere corrosion performance reduce, and in manufacturing processed, S content is more low better, but S content is controlled too low increase production cost, is therefore controlled by S at≤0.002%0.08% ~ 0.25%.
Ni and Cu: add the resistance to sea atmosphere corrosion performance that the alloying elements such as appropriate Ni, Cu are conducive to improving steel in steel, Ni, Cu and alloying element P acting in conjunction, form fine and close Ni-Cu-P film at steel surface, effectively can stop eroded elements Cl in marine atmosphere
-, O
2-react Deng with steel, containment corrosion.But when Ni content is lower than 0.15%, then can cause the Ni formed
no
m, Mo
ani
bamount very little, can not protect Fe matrix effectively, and erosion rate increases.As higher than 0.30%, then can cause waste again, uneconomical, therefore its content is controlled 0.15% ~ 0.30%, preferably Ni is controlled 0.23 ~ 0.30%; When Cu content is lower than 0.5%, then form Cu
xo
yamount very little, can not stop O effectively
2-intrusion, erosion rate increases, and as higher than 0.90%, then can cause again forming thermal crack in the fabrication process, scrap rate is high, and production cost increases, therefore controls 0.5% ~ 0.9% by its content, preferably controls 0.62 ~ 0.83% by Cu;
Mo: the Mo adding certain content in steel, pearlitic formation can be stoped, impel bainite+fine ferrite organization formation, obtain the steel of yield strength >=800MPa, on the other hand, steel plate is in heat treatment furnace inside holding 1 ~ 2 hours period of 600 ± 30 DEG C, and Mo can stop atom long-range to spread, and ensures the intensity of steel.Mo belongs to expensive alloy element, should not too much add, therefore controls 0.08% ~ 0.18%, preferably controls 0.087 ~ 0.145%.
The interior thickness of steel plate after the rolling of hot rolling first stage controls at 60 ~ 120mm, object is in order to crystal grain thinning in the operation of rolling further, setting workpiece thickness, 70% bainite structure can be obtained after subordinate phase rolling, obtain the mechanical property of yield strength >=800MPa on the one hand, obtain bainite+ferritic similar tissue on the other hand, there is good corrosion resistance nature.
Steel plate is at the heat treatment furnace inside holding 1 ~ 2 hour of 600 ± 30 DEG C, and object is to eliminate the unrelieved stress that steel plate produces in the fabrication process, reduces the stress value of steel in operational process.
The present invention compared with prior art, yield strength be not less than 800MPa, year erosion rate lower than 0.19g/mm
2y, and hot and cold processing performance is excellent, is cut into point relatively simple, easy to control.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are produced according to following steps:
1) converter smelting the content of control S become thickness to be the slab of 200 ~ 300mm in setting range, continuous pouring;
2) to strand soaking, controlling strand soaking temperature is: 1180 ~ 1250 DEG C;
3) be rolled in two stages: control first stage start rolling temperature and be not less than 990 DEG C, its end temp is not less than 950 DEG C, and controls workpiece thickness at 60 ~ 120mm; Control subordinate phase start rolling temperature not higher than 940 DEG C, its stage finishing temperature is at 770 ~ 880 DEG C;
4) carry out water-cooled, under speed of cooling is 5 ~ 25 DEG C/s, is cooled to 470 ~ 570 DEG C;
5) room temperature is naturally cooled to;
6) carrying out isothermal holding to steel plate, is that the lower insulation of 570 ~ 630 DEG C is after 1 ~ 2 hour in holding temperature;
7) after coming out of the stove, air cooling is to room temperature.
The chemical composition (wt.%) of table 1. various embodiments of the present invention and comparative example
The main technologic parameters of table 2. various embodiments of the present invention steel and comparative example and performance
As can be seen from Table 2, visible, by the steel yield strength of present component and explained hereafter all higher than 800MPa, year, erosion rate was lower than 0.19g/mm
2y.Not in composition of steel scope of the present invention or/and production technique compared steel yield strength is not within the scope of the present invention lower than 602MPa, year, erosion rate was higher than the present patent application steel grade more than 5 times, should not for the manufacture of large ocean job facilities.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. the method for the corrosion-resistant ocean structure steel of production yield strength >=800MPa, its step:
1) converter smelting the content of control S become thickness to be the slab of 200 ~ 300mm in setting range, continuous pouring; The component of slab and weight percent content are: C:0.08 ~ 0.18%, Si:0.15% ~ 0.25%, Mn:1.10% ~ 1.50%, P:0.08% ~ 0.25%, S≤0.002%, Ni:0.15% ~ 0.30%, Cu:0.5% ~ 0.9%, Mo:0.08% ~ 0.18%, remaining is Fe and inevitable impurity;
2) to strand soaking, controlling strand soaking temperature is: 1180 ~ 1250 DEG C;
3) be rolled in two stages: control first stage start rolling temperature and be not less than 990 DEG C, its end temp is not less than 950 DEG C, and controls workpiece thickness at 60 ~ 120mm; Control subordinate phase start rolling temperature not higher than 940 DEG C, its stage finishing temperature is at 770 ~ 880 DEG C;
4) carry out water-cooled, under speed of cooling is 5 ~ 25 DEG C/s, is cooled to 470 ~ 570 DEG C;
5) room temperature is naturally cooled to;
6) carrying out isothermal holding to steel plate, is the lower insulation 1 ~ 2 hour of 570 ~ 630 DEG C in holding temperature;
7) after coming out of the stove, air cooling is to room temperature; The final mechanical property of its steel plate is: yield strength is all not less than 800MPa, year erosion rate be less than 0.19g/mm
2y, metallographic structure: bainite accounts for volume percent and is not less than 70%, all the other are ferrite.
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|---|---|---|---|
| CN201410092715.4A CN103805856B (en) | 2014-03-14 | 2014-03-14 | The corrosion-resistant ocean structure steel of yield strength >=800MPa and production method |
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|---|---|---|---|
| CN201410092715.4A CN103805856B (en) | 2014-03-14 | 2014-03-14 | The corrosion-resistant ocean structure steel of yield strength >=800MPa and production method |
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| CN103805856B true CN103805856B (en) | 2015-12-30 |
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| CN107254628B (en) * | 2017-05-24 | 2019-03-29 | 首钢集团有限公司 | A kind of resistance to SO2 and the construction(al)steel and production method of the corrosion of low chlorine ion concentration |
| CN115976428B (en) * | 2022-12-12 | 2024-04-16 | 广东省科学院新材料研究所 | Ocean atmospheric corrosion resistant high-phosphorus weather resistant steel and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594463A (en) * | 1979-01-12 | 1980-07-17 | Nippon Steel Corp | Petrochemical plant or high tensile bolt steel having hydrogen penetration preventing effect |
| CN101984119A (en) * | 2010-11-26 | 2011-03-09 | 江苏省沙钢钢铁研究院有限公司 | NV-F690 ultrahigh strength ship plate steel and manufacture method thereof |
| CN103302255A (en) * | 2012-03-14 | 2013-09-18 | 宝山钢铁股份有限公司 | Manufacturing method of thin-strip casting 700 MPa grade high-strength weather resisting steel |
| CN103305759A (en) * | 2012-03-14 | 2013-09-18 | 宝山钢铁股份有限公司 | Thin strip continuous casting 700MPa grade high-strength weather-resistant steel manufacturing method |
-
2014
- 2014-03-14 CN CN201410092715.4A patent/CN103805856B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594463A (en) * | 1979-01-12 | 1980-07-17 | Nippon Steel Corp | Petrochemical plant or high tensile bolt steel having hydrogen penetration preventing effect |
| CN101984119A (en) * | 2010-11-26 | 2011-03-09 | 江苏省沙钢钢铁研究院有限公司 | NV-F690 ultrahigh strength ship plate steel and manufacture method thereof |
| CN103302255A (en) * | 2012-03-14 | 2013-09-18 | 宝山钢铁股份有限公司 | Manufacturing method of thin-strip casting 700 MPa grade high-strength weather resisting steel |
| CN103305759A (en) * | 2012-03-14 | 2013-09-18 | 宝山钢铁股份有限公司 | Thin strip continuous casting 700MPa grade high-strength weather-resistant steel manufacturing method |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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